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KB5124010: Overview with user sentiment and feedback

Last Updated October 15, 2026

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Known Issues

Overview

KB5124010 is the September 22, 2026 non-security preview (optional) cumulative update for Windows 11 versions 26H2, 25H2, and 24H2, with OS builds 26300.9550, 26200.9550, and 26100.9550. It is the final preview update for version 24H2, whose Home and Pro editions reach end of updates on October 13, 2026. Enterprise and Education 24H2 remain supported until October 12, 2027.

General Purpose

  • File Explorer: preview pane now asks before previewing HTML from the web; Home keeps section expand/collapse state.
  • Bluetooth: better audio stability, LE Audio performance, microphone compatibility, and a fix for a 0x139 crash during streaming.
  • New features: Open apps maximized accessibility setting, Tips widget, Emoji 17.0, touchpad single-finger and automatic scrolling, and a Copilot key remap option.
  • Other: Ebrima font gains Garay and Beria Erfe; Windows Recovery can reuse saved Wi-Fi profiles; PC-to-PC Migration removed from Windows Backup; permanent DST for British Columbia and Alberta from November 2026.
  • Fixes: domain-joined devices losing secure trust, built-in camera stopping, File History false "Reconnect your drive" errors, and Sysmon fixes.

General Sentiment

No substantive community discussion about KB5124010 was included in the provided data, so reception could not be assessed. Microsoft's own notes list several open issues, which warrants caution for enterprise and Remote Desktop environments.

Known Issues

  • Non-admin Remote Desktop connections to hosts with Administrator protection may fail with error 0xC000000D (workaround: temporarily disable Administrator protection).
  • Legacy apps requiring AC-3 audio decoding may fail to launch or close unexpectedly (resolved in KB5127648 and later).
  • Desktop black screen or loading issues after sign-in, mainly on AVD hosts using FSLogix (resolved in KB5127648 and later).
  • USB Audio Class 1.0 devices may show Code 10 or produce no audio after the September 8, 2026 security update (no fix yet).

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-15 01:47 AM

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